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Device for magnetic separation of finely dispersed raw material

IPC classes for russian patent Device for magnetic separation of finely dispersed raw material (RU 2295392):

B03C1/24 - with material carried by travelling fields

Another patents in same IPC classes:

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Proposed device may be used for separation admixtures possessing different magnetic properties from inert medium. Proposed device has taper vibrating feeder, separation chamber, revolving magnetic system made in form of hollow vertically oriented dielectric cylinder with permanent magnet units located radially along its axis. Separation chamber is made in form of hollow perforated cylinder located coaxially inside magnetic system; this cylinder is made from dielectric material and is provided with holes, 2-3 mm in diameter which are located in area of action of magnetic system. Fins wound spirally around perforated cylinder of separation chamber in way of holes; these fins are also made from dielectric material and their width is lesser than distance between inner perforated cylinder and magnetic system by 1-2 mm.

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FIELD: separation of strongly magnetic, paramagnetic and diamagnetic admixtures from any inert finely dispersed medium; concentration of minerals in processing dump in mining industry; extraction of magnetic, paramagnetic and diamagnetic admixtures in food-processing industry.

SUBSTANCE: proposed device may be used for separation admixtures possessing different magnetic properties from inert medium. Proposed device has taper vibrating feeder, separation chamber, revolving magnetic system made in form of hollow vertically oriented dielectric cylinder with permanent magnet units located radially along its axis. Separation chamber is made in form of hollow perforated cylinder located coaxially inside magnetic system; this cylinder is made from dielectric material and is provided with holes, 2-3 mm in diameter which are located in area of action of magnetic system. Fins wound spirally around perforated cylinder of separation chamber in way of holes; these fins are also made from dielectric material and their width is lesser than distance between inner perforated cylinder and magnetic system by 1-2 mm.

EFFECT: enhanced efficiency; possibility of separating mixtures into phases.

2 dwg

Device for separation of fine raw materials intended for the selection of any inert fine environment sinnamahoning, paramagnetic and diamagnetic impurities and can be used for mineral processing, processing of waste dumps mining industry, as well as to extract magnetic, paramagnetic and diamagnetic impurities in the food processing industry etc.

There are various ways to mineral processing - gravitational, electrical, radiometric, flotation, magnetic, adhesive, chemical and combined.

Magnetic methods of enrichment based on the difference in magnetic properties and magnetic susceptibility of the partial minerals. Depending on the environment in which produces the separation of minerals, there are dry and wet methods of magnetic separation.

A negative feature of wet separation, which, as a rule, the subject material is less than 3-6 mm, is the higher the resistance of the water environment promotion of magnetic and nonmagnetic particles (compared to air). Which is extremely unfavorable for the separation of fine particles, resulting in some of the most subtle particles lost from the non-magnetic product.

Dry separation is subjected to the largest material is STU from 3 to 50-100 mm, because the enrichment of smaller material is strong dust formation (Abramov A.A. Refining, processing and comprehensive utilization of solid minerals", Moscow, Ed. Moscow state mining University, 2004).

Usually to extract Selfnominated minerals from ores using drum separators with low magnetic field strength generated fixedly mounted inside the rotating drum open magnetic system, the polarities of which alternate around the perimeter of the drum to provide a magnetic stirring of the material. The disadvantage of such devices is that the separation of fine-grained Selfnominated materials with decreasing size of the particles in addition to dust increases their flocculation and selective adhesion, which leads to a sharp deterioration in the quality of the concentrate by capturing floculate nonmagnetic grains and aggregates. Destruction of flocs in existing devices achieve using enhanced frequency of rotation of the drum around the multipolar system of permanent magnets. Such separately are foreign separators "Mardel" and "Laurie"CIS - speed separators type PLTC-63/50.

The separator PBSC-63/50 has a multi-pole magnetic system with poles of ferretbrain magnets. Step poles is istemi is 50 mm, the drum rotation frequency of 300 rpm, the new frequency magnetic field is 90 Hz (Abramov A.A. Refining, processing and comprehensive utilization of solid minerals", Moscow, Ed. Moscow state mining University, 2004).

A common disadvantage of the known devices is that they do not allow to divide the allocated impurity fractions depending on their magnetic properties.

The closest to the technical nature of the claimed device is a magnetic separator analyzer periodic action copyright certificate №1651966, IPC 5 In 03 With 1/06, publ. 30.05.1991, containing cone feeder, a separating chamber, a rotating magnetic system made in the form of rotating around the vertical axis of the casing, on which radially arranged with alternating polarity of the primary and secondary magnets, and the additional magnets shorter core, and the outer ends of the magnets are located on the same circle. In this device the material to be split in the separating chamber, is covered by the alternating traveling magnetic field, the magnetic particles are moved towards the field in a spiral to the center of the cage. At the ends of the additional magnets are going particles with the highest magnetization at the ends of the main magnets - particles smaller than the magnetization, in the center of the particle with the minimum magnetization, on the periphery of the shroud going nonmagnetic particles. The speed of rotation of the disk in the device is equal to about 5-10/C. This device is intended to improve the quality of analysis due to the separation of the product into fractions with different magnetic properties. However, a disadvantage of this device is the lack of complete separation, i.e. the presence of separated fractions of mineral particles from other factions. In addition, it cannot be used on an industrial scale, because for dividing the magnetic phase to separate the components for each particular case, you need to find the distance between the magnetic system and the separation chamber.

The objective of the proposed technical solution is expanding Arsenal of devices for dry magnetic separation with simultaneous separation of impurities inert raw materials for magnetic, weakly magnetic, paramagnetic and diamagnetic components.

The problem is solved through the use of a rotating alternating-pole magnetic fields, which are the device containing cone feeder, the separating chamber, a rotating magnetic system with a radial arrangement of permanent magnets with alternating polarity, in which, unlike the prototype, the rotating magnetic system is mA made in the form of a hollow vertically oriented dielectric cylinder, on the outer side of which is radially along its axis are alternating in polarity rows of permanent magnets of one polarity in a row. The separation chamber is a located coaxially inside the magnetic system of a hollow perforated cylinder of a dielectric material in which the hole diameter is not more than 2-3 mm are in part located in a region of the magnetic cylinder. Around the cylinder of the separation chamber downstream of the location of the holes spirally wound edges of a dielectric material having a width of 1-2 mm less than the distance between the inner perforated cylinder of the separation chamber and the magnetic system.

The proposed device can be recognized as appropriate criteria of "novelty" and "inventive step", because it has the following distinctive features:

- performance magnetic system in the form of a hollow vertically oriented dielectric cylinders arranged radially on its outer side along the axis of the cylinder alternating in polarity rows of blocks of permanent magnets of one polarity in the series;

- performance magnetic system to rotate at a speed ranging from 1000 to 5000 rpm for ϕ (phase shift of the particles) exceeding critical. This technical solution allows to achieve magnetization reversal mage is etnich particles, and also cause electric voltages and currents in electrically conductive particles, which contributes to the separation of particles even with close values of the magnetic susceptibility due to their intense magnetic stirring to prevent the formation of flocs, i.e. leads to a more careful division of the environment into fractions;

- execution of the separation chamber in the form of a hollow perforated cylinder of a dielectric material that is located coaxially inside the magnetic system, in which the hole diameter is not more than 2-3 mm are located in part in the action of the magnetic system;

- the presence of the perforated cylinder of the separation chamber edges of a dielectric material with a width of 1-2 mm less than the distance between the inner perforated cylinder and a magnetic system, spirally wound along the hole location and designed to lead passed through the holes magnetic, weakly magnetic and paramagnetic particles in a special collection.

Thus, the proposed device with the above features allows you to simultaneously select from the cleaned inert atmosphere and divide by fractions of impurities with different magnetic properties. Magnetic, weakly magnetic and paramagnetic particles (due to the coincidence with the direction of the emerging mage is itogo moment in the paramagnetic particles with the direction of the current field) as a result of attraction to the magnetic system pass through the apertures in the perforated cylinder and flow down the spiral ribs. They do not stick to the cylinder, magnetic system, due to the fact that during high speed rotation of the magnetic system creates a variable external magnetic field, which acts on the particles the force of gravity, the force of repulsion, which results in a "fluidized bed" magnetic particles near the inner part of the cylinder wall. Diamagnetic particles, due to the fact that the direction of the magnetic moment arising in them under the influence of a magnetic field, opposite to the direction of the current magnetic fields are concentrated in the center of the separation chamber, and the inert medium is poured vertically downwards. The device is environmentally friendly and its use improves working conditions, because it is enclosed in a sealed casing and selected fractions are immediately poured in dedicated storage tanks by special branch pipes, which is an additional advantage of the proposed device, as eliminated dusting. And even for the purification of very fine raw material is not necessary to conduct a preliminary dedusting or enter into the design of the separator dust extraction system.

The technical solution is characterized by the following figures:

Figure 1 - drawing;

Figure 2 - General view of the device.

The device consists of vibrating feeder 1, provided with a dielectric cone 2, separats the Onna camera in the form of a hollow perforated dielectric cylinder 3 located thereon in staggered holes 4, provided with ribs 5, is wound spirally along the location of the holes 4. The dielectric cylinder 3 of the separation chamber is located coaxially inside the rotating magnetic system, which is a hollow vertically oriented cylinder 6 of a dielectric material containing on its outer side alternating in polarity rows spaced radially along the axis of the cylinder 6 blocks of permanent magnets 7 of one polarity in a row. With the 4 holes with a diameter of not more than 2-3 mm are located in the part of the dielectric cylinder 3, in the actions pane of the magnetic system, and the width of the ribs 5 1-2 mm less than the distance between the inner perforated cylinder 3 of the separation chamber and the magnetic system.

The separator operates as follows. Dry fine powder And is supplied to the feeder 1, where the dielectric cone 2 in a steady stream through the holes 8 is poured vertically down into the separation chamber without touching the sides of the perforated cylinder 3 of the separation chamber, and falls under the action of rotating alternating-pole magnetic field generated when the rotation speeds of from 1000 to 5000 rpm magnetic system consisting of a hollow vertically oriented dielectric cylinder 6 and located on its radially outer side of the Dole axis alternating in polarity rows of blocks of permanent magnets 7 of one polarity in a row. Changing during the rotation of the magnetic system of the magnetic field of the magnetic system and the magnetized field particles that fall under the scope of these fields, at high speed cylinder 6 reaches exceeding the critical phase shift ϕ. Therefore, particles B: magnetic, weakly magnetic, and even paramagnetic (due to the coincidence of the direction of the resulting magnetic moment in the paramagnetic particles with the direction of the current field) as a result of attraction to the magnetic system pass through the apertures 4 in the perforated cylinder 3 and flows along a spiral ribs 5 through the outlet pipe (figure 2) in a special container for magnetic particles. These particles do not stick to the walls of the magnetic system, because of frequent changes of direction of the magnetic field act on them that the forces of magnetic attraction, the force of magnetic repulsion, which results in a "fluidized bed" magnetic particles near the inner part of the cylinder wall 6. Diamagnetic particles G due to the fact that the direction of the magnetic moment arising in them under the influence of a magnetic field, opposite to the direction of the current magnetic fields are concentrated in the center of the separation chamber and are removed through outlet pipe 9, which is in a magnetic field of not less than 1 cm, and the inert environment is poured vertically downwards and removed on the leading pipe (Figure 2).

The proposed device allows you to simultaneously select from the cleaned inert atmosphere and divide by fractions of impurities with different magnetic properties. Moreover, by eliminating the dust, even for the purification of very fine raw material is not necessary to conduct a preliminary dedusting or enter into the design of the separator dust extraction system.

A device for magnetic separation of fine raw materials containing cone feeder, the separating chamber, a rotating magnetic system with a radial arrangement of permanent magnets with alternating polarity, wherein the rotating magnetic system is made in the form of a hollow vertically oriented dielectric cylinders arranged radially on its outer side along the axis of the cylinder rows of blocks of permanent magnets of one polarity in a row, the separation chamber is a located coaxially inside the magnetic system of a hollow perforated cylinder of a dielectric material with holes with a diameter of not more than 2-3 mm, which are located in part in the action of the magnetic system, with around a perforated cylinder separation camera during drilling and spirally wound edges of a dielectric material having a width of 1-2 mm less than the distance is a distance between the inner perforated cylinder and a magnetic system.